The Isole Tremiti, also called "Isole Diomedee" are an archipelago in the Adriatic Sea, north of the Gargano Peninsula. They constitute a "comune" of Italy's Province of Foggia and form part of the Gargano national park.
The islands were used for the internment of political prisoners during Benito Mussolini's Fascist regime. But it was also the prison of Julia the Younger, the granddaughter of Augustus and, in 780, the prison of Paul the Deacon at the behest of Charlemagne.
The islands are now an important tourist attraction because of the clear waters surrounding them. Up to 100,000 visitors come to the islands in the summer season. Ferry services from the mainland operate from Termoli, Vieste, Rodi Garganico and Capoiale, while Alidaunia offers flights from San Domino Heliport to Foggia and Vieste.